JPH0991110A - Virtual three-dimensional space display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow an operator to always grasp a spatial position by setting the change range of a sight line direction corresponding to the relation between the reference position of an object and the position of a sightpoint. SOLUTION: In sightpoint ground height calculating processing (S102), the land height difference between the height of the sightpoint position and the height of ground surface (reference position) is found as the sightpoint ground height. Next, in projecting object elevation angle calculating processing (S103), among the buildings constituting a town displayed now in the visual fields, the elevation angles of highest parts of those buildings are calculated from the current sightpoint position, and the largest value among those elevation angles is found as a projecting object elevation angle. Next in an elevation angle limit calculating processing (S104), the elevation angle limit range in the sight line direction is found from the calculated sightpoint ground surface height and projecting object elevation angle. Then, in sightpoint/sight line changing processing (S105), the sightpoint position or the sight line direction is changed corresponding to the kind of provided operations.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a virtual three-dimensional space display device for changing a viewpoint position and a line-of-sight direction with respect to an image in a virtual three-dimensional space displayed on a display means such as a display by operating an operating means such as a mouse. Regarding

[0002]

2. Description of the Related Art In recent computer graphics, a three-dimensional image in a virtual three-dimensional space is generated and displayed on a display means such as a display, and its viewpoint position (coordinates in the virtual three-dimensional space) is instructed by an operator. And changing the viewpoint direction (image display direction in the virtual three-dimensional space) so that you can have an experience of flying around the three-dimensional space in a pseudo manner (hereinafter referred to as "fly-through"). Has become.

In such a virtual three-dimensional space display, 3 is displayed.
Fly through the three-dimensionally displayed terrain to visually observe the ups and downs of the land, and fly through the three-dimensionally modeled sky to provide city guides and tourist information. It is applied to a dimensional visual information system.

For example, when interactively changing a three-dimensional image of computer graphics while flying through a mountainous area or an urban area, an operator operates an operating means such as a mouse, a joystick, or a three-dimensional mouse. Forward and backward of the viewpoint position, up and down,
Instructions such as turning the line of sight to the left, right, looking up, and looking down. The computer interprets the instruction from the operator, changes the viewpoint position and the line-of-sight direction in the virtual three-dimensional space displayed on the display, etc., and performs display based on image generation corresponding to this.

When an operator uses a 6-degree-of-freedom operation means capable of measuring each coordinate along the three-axis directions of a space such as a three-dimensional mouse and the rotation angle corresponding to each axis,
Moving the 3D mouse forward moves the viewpoint position forward, moving backward moves the viewpoint position backwards, moving upward moves the viewpoint position downwards, and moving it downward moves the viewpoint position downwards. To do. Further, if the eye is twisted left and right around the vertical axis, the line-of-sight direction is rotated left and right, and if it is twisted up and down around the horizontal axis, the line-of-sight direction is moved up and down.

Further, the amount of change in the viewpoint position and the line-of-sight direction changes depending on the amount of movement of the three-dimensional mouse in each direction. For example, if the operator moves the three-dimensional mouse slightly forward, the viewpoint position slightly advances according to the amount of movement. On the other hand, if the three-dimensional mouse is moved far forward, the viewpoint position greatly advances according to the amount of movement.

Mouse (two-dimensional) as an operating means
When using the or joystick, move these operating means forward to move the viewpoint forward, backward to move the viewpoint backward, and move left or right to rotate the line of sight left or right. Set it. Also, by using mouse and joystick operations and button operations together, you can move the viewpoint position to the left and right, look up and down in the line of sight,
Allows you to set up and down the viewpoint position.

An operator operates such an operating means to arbitrarily change the viewpoint position and the line-of-sight direction in a virtual three-dimensional space such as a display, thereby changing the display direction of a stereoscopic image to realize fly-through. are doing.

[0009]

However, in such a virtual three-dimensional space display, when the virtual three-dimensional space in which fly-through is performed is a mountainous area or an urban area, the operator operates the viewpoint position and the line-of-sight direction to fly over the sky. When you look at the direction directly above, or when you look directly below, near the ground,
Only the view of the sky or the view of the ground is displayed in a uniform state on the screen.

This state will be described with reference to FIG. Figure 7
At the viewpoint position S ₁ shown in (a), if the line-of-sight direction is horizontal,
If the line-of-sight direction is directly above the viewpoint position S ₂ , the viewpoint position S ₃
Shows the visual fields when the line-of-sight direction is directly below. Here, when the ground surface is at the position G, the viewpoint position S ₁ ,
In S ₂ , only the scenery of the sky is displayed on the screen. When the ground surface is G ′, only the view of the sky can be seen at the viewpoint position S ₂ and only the view of the ground can be seen at the viewpoint position S ₃ .

In such a state, only a monotonous image with little change is displayed on the screen, or only a planar image with little change in depth is displayed. You will end up in a confused state where you will not know which gaze direction you are looking at from the viewpoint. In such a confused state, the operator may be afraid to operate the operating means or may be forced to uselessly move the operating means.

[0012] Therefore, simply it is conceivable to thereby determine the range of viewing direction, as shown in FIG. 7 (b), the viewpoint position S ₄ are the building near the viewpoint position S ₄ even close to the surface G When there is B or the like, the upper part of the building B can be seen when looking up at the sky, so a simple limitation of the line-of-sight direction is not sufficient for performing fly-through.

[0013]

The present invention is a virtual three-dimensional space display device which has been made to solve such a problem. That is, the virtual three-dimensional space display device of the present invention is a device for changing the viewpoint position and the line-of-sight direction with respect to the image in the virtual three-dimensional space displayed on the display means by operating a predetermined operation means, and the virtual three-dimensional space. Position calculation means for calculating the distance between a predetermined reference position and the viewpoint position in the virtual three-dimensional space, and the range of change in the line-of-sight direction by the operation of the operation means is set based on the distance calculated by this position calculation means. And a line-of-sight range setting means.

According to the positional relationship between the viewpoint position and the reference position such as the ground surface or an object protruding from the ground surface calculated by the position calculation means, the change range of the line of sight direction by the operation of the operation means is set by the sight line range setting means. Therefore, the angle formed by the horizontal plane in the line-of-sight direction (hereinafter referred to as “elevation angle”) can be limited depending on the altitude of the viewpoint position from the ground surface and the positional relationship such as the angle of looking up the protruding object from the viewpoint position. .

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a virtual three-dimensional space display device of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram illustrating an embodiment of the present invention, and FIG. 2 is a block diagram illustrating a hardware configuration. In this embodiment,
The operator operates the operation means to change the viewpoint position and the line-of-sight direction with respect to the image in the virtual three-dimensional space displayed on the display means.

As a hardware configuration for realizing this, as shown in FIG. 2, a computer main body 10 (for example, a workstation or a personal computer) including a CPU 1, a memory 2 and the like, and a mouse as an operating means. 3, joystick 4, 3D mouse 5,
It is composed of a keyboard 6 (any one or more of these may be used), a speaker 7, a CRT 8 as output means, and an external storage device 9 for storing predetermined data.

The operator operates the operating means such as the mouse 3, the joystick 4, the three-dimensional mouse 5 and the like to display the CRT.
The viewpoint position and the line-of-sight direction with respect to the image in the virtual three-dimensional space displayed in 8 are changed. For example, when the joystick 4 is used, the joystick 4 is operated to move the viewpoint position forward and backward in the virtual three-dimensional space, to move up and down, and to rotate left and right in the line-of-sight direction and to give instructions such as looking up and looking down. Go and change the display of the image in the virtual three-dimensional space. As a result, it becomes possible to fly through, for example, a mountainous area or an urban sky in the virtual three-dimensional space displayed on the CPU 1.

When the joystick 4 with force feedback is used, a torque motor (not shown) is attached to an encoder unit (not shown) for measuring the amount of rotation of the stick portion, and a control circuit ( The amount of torque generated with respect to rotation is controlled by (not shown), and the movement of the stick portion is made heavy to generate a resistance feeling of operation. Further, in the case of using the three-dimensional mouse 5 having a vibration function, by controlling the vibration interval, when a large resistance feeling is desired, a short interval vibration is applied and a small resistance feeling is desired. I'm trying to give you a long interval vibration.

In order to realize the virtual three-dimensional space display device of this embodiment with such a hardware configuration, each processing in the device shown in FIG. 1 is configured by software in the CPU 1 shown in FIG. It is configured on a function processing board or as a semiconductor device for calculation.

Next, the virtual three-dimensional space display device of the present embodiment including the processing in the position calculating means P, the line-of-sight range setting means Q, the line-of-sight direction returning means R, and the operation feeling generating means T is constituted by software. The case will be described as an example. At this time, FIG. 1 is regarded as a flowchart showing an operation procedure of the virtual three-dimensional space display device.

That is, in the virtual three-dimensional space display device according to this embodiment, the operation amount input process (S101), the viewpoint ground surface altitude calculation process (S102), the protruding object elevation angle calculation process (S103), and the elevation angle restriction calculation process (S104). , A viewpoint / line-of-sight changing process (S105), a drawing process (S106), an elevation angle returning process (S107), and an elevation angle operation feeling process (S108) are repeatedly executed to perform fly-through in the virtual three-dimensional space. To be realized.

Thus, based on the distance between the predetermined reference position and the viewpoint position in the virtual three-dimensional space in the virtual three-dimensional space, the range of change in the line-of-sight direction by the operating means such as the mouse 3 (see FIG. 2) is determined. It is characterized in that the operability is improved by setting it so that the operator does not fall into a confused state when manipulating the viewpoint position or the line-of-sight direction.

Before performing each processing, fixed data is stored in advance in the external storage device 9 shown in FIG. This fixed data includes, for example, a triangular polygon group that forms a terrain and a triangular polygon group that forms a building in an urban area. Each triangular polygon is made up of data such as three vertex coordinates used for computer graphics rendering processing, a surface normal vector, color information, and a surface light reflection coefficient. In addition, the triangular polygons that compose a building in an urban area are collectively managed for each building, and it is assumed that it also has information on a minimum rectangular parallelepiped (hereinafter referred to as a "bounding box") that surrounds the entire building.

Next, the respective processes shown in FIG. 1 will be described in order.
First, in the operation amount input process (S101), the state of operation means such as the mouse 3, the joystick 4, and the three-dimensional mouse 5 shown in FIG.
Is performed, and processing for extracting how much the operation amount is is performed. The operation means such as the mouse 3, the joystick 4, and the three-dimensional mouse 5 have predetermined meanings for each operation. For example, in the case of the joystick 4, push the stick part forward to advance the viewpoint position, pull backward to move backward, tilt left or right to rotate the line of sight left or right, and press the button forward to look down the line of sight. Change (decrease the elevation angle), if you push the button and pull backwards, you can change to look up the direction of the line of sight (increase the elevation angle).

In the operation amount input process (S101), the type of operation and the operation amount of the operation means are read based on the meaning determined for each operation means. For example, in the joystick 4, it is taken out that the button is pushed and the stick portion is pushed forward, and the pushed amount is 0.5 (unit is arbitrary).

In the next viewpoint ground surface altitude calculation process (S102), the triangular polygon of the terrain located immediately below the viewpoint position in the current virtual three-dimensional space is the highest altitude among the altitudes of the vertices of the triangular polygon. The altitude is set as the altitude of the ground surface (reference position), and the difference between the altitude of the viewpoint position and the altitude of the ground surface (reference position) is calculated as the viewpoint ground surface altitude. The elevation of the ground surface is not limited to this method, but may be determined from the elevations of these vertices, including the triangular polygon of the terrain located directly below the viewpoint position and the triangular polygons in the vicinity thereof.

Next, the projection object elevation angle calculation process (S10)
In 3), for the buildings that compose the urban area, which are within the range of the field of view currently displayed, the elevation angle of the top of the building is calculated from the current viewpoint position, and the largest value of the elevation angles is calculated. Calculate as the elevation angle of the protruding object.

FIG. 3 is a diagram for explaining the elevation angle when there is a building. That is, when there is a building B built on the ground surface G, the minimum rectangular parallelepiped surrounding the entire building B is set as the bounding box B ′. The protruding object elevation angle θ at this time is obtained from the angle of the straight horizontal line connecting the viewpoint position S and the corner of the bounding box B ′.

Next, in the elevation angle restriction calculation process (S104), the elevation angle restriction range in the line-of-sight direction is obtained from the viewpoint ground surface altitude and the projection object elevation angle calculated previously. In this procedure, first, from the viewpoint ground surface altitude (h), the upper limit value of the elevation angle (max_a
angle) and the lower limit value (min_angle) are obtained by the method described below, and then the projecting object elevation angle (building angle) is calculated.
_Angle) and the upper limit value (max_angle) are compared.

If the expression (1) is satisfied in this comparison, the upper limit value (max_angle) is set to the protruding object elevation angle (b).
Modifying to (building_angle).

[0031]

## EQU00001 ## building_angle> max_angle (1)

The range between the lower limit and the upper limit of the elevation angle thus obtained is the elevation limit range output in the elevation limit calculation process (S104).

Next, a method for obtaining the upper limit value and the lower limit value of the elevation angle from the viewpoint ground altitude will be described with reference to FIG. FIG. 4 is a diagram for explaining the limitation of the elevation angle depending on the altitude. The horizontal axis represents the viewpoint ground altitude, and the vertical axis represents the elevation angle. The curve F ₁ in the figure represents the upper limit value of the elevation angle at each altitude, and the curve F ₂ represents the lower limit value of the elevation angle at each altitude. Therefore, the area between the curves F ₁ and F ₂ is the elevation angle limit range.

For example, when the altitude is h in FIG. 4, the intersection point H _{1 of} the perpendicular line passing h and the curve F ₁ is the upper limit of the elevation angle, and the intersection point H of the perpendicular line passing h and the curve F ₂ is
₂ is the lower limit of elevation.

Therefore, the curves F ₁ and F ₂ are determined in advance from the data of the target three-dimensional space, but can be determined as follows, for example. First, the curve F ₁ will be described. The operator is confused because it is difficult to grasp the spatial view of the displayed 3D image only in the sky, but at least the horizon is displayed at the bottom of the 3D image. You will not be confused. Therefore, the angle at which at least the horizon is displayed at the bottom of the three-dimensional image is the upper limit of the elevation angle.

Here, when the distance to the horizon is L and the half of the vertical viewing angle is fov based on the planar spread of the three-dimensional space, the upper limit value of the elevation angle at the altitude h (max_an
The relationship of gle) is as shown in equation (2).

[0037]

Tan (fov-max_angle) = h / L (2)

The curve represented by the equation (2) is F ₁ .

Next, the curve F ₂ will be described. The curve F ₂ shown in FIG. 4 has an elevation angle of −π / 2 as the altitude increases. This is because when the altitude of the viewpoint is high, a wide change in the terrain and the cityscape are displayed as a three-dimensional image even when looking directly below. However, when the altitude is lowered while looking straight down from this viewpoint position, the scenery of the surface of the earth gradually approaches, and only the narrow area located directly below can be seen. It becomes difficult for the operator to grasp spatially.

Therefore, if the lower limit value of the elevation angle is determined so that the region of radius R is always displayed in the three-dimensional image as the spread of the ground surface, it is possible to avoid the difficulty of spatial grasping. As a result, the minimum altitude h ₀ at which the lower limit of the elevation angle is −π / 2 is represented by the equation (3).

[0041]

(3) tan (fov) = R / h ₀ (3)

Further, as an example of setting the lower limit value of the elevation angle between the altitude of zero and h ₀ , equation (4) is obtained by calculating the relation between the minute change in elevation angle and the length on the ground surface by differential calculation. Can be used.

[0043]

## EQU00004 ## sin ² (min_angle) = h / h ₀ (4)

The curves F ₁ and F ₂ shown in FIG. 4 are not limited to the equations (2) to (4) shown above, and may be set by other equations or other methods.

Next, the viewpoint line-of-sight changing process (S1 shown in FIG.
In 05), the viewpoint position and the line-of-sight direction are changed according to the type of operation obtained by the operation amount input process (S101). For example, if the type of operation on the joystick 4 (see FIG. 2) is “push forward”, it means “forward” as described above, so that the viewpoint position corresponds to the amount of operation along the line-of-sight direction. Change.

The process of changing the elevation angle in the line-of-sight direction, which is a feature of this embodiment, will be described in order with reference to the flow charts shown in FIGS. First, the elevation angle limiting process is performed according to the flowchart shown in FIG. That is, the elevation angle in the line-of-sight direction designated by the operating means is changed in the elevation angle calculation shown in step S201. Next, step S202.
By the determination shown in step S1, it is determined whether the new elevation angle calculated in step S201 is within the elevation angle limitation range calculated by the elevation angle limitation calculation process (S104) shown in FIG.

If the elevation angle is within the limit range, the answer is Yes and the elevation angle is changed as it is.
Then, the elevation angle is restricted as shown in step S203. This state will be described with reference to FIG. 4. When the elevation angle is larger than the upper limit value H _{1 of the} elevation angle as indicated by H ₃ in the figure, the elevation angle is limited to H ₁ and indicated by H ₄ in the figure. When the elevation angle is smaller than the lower limit value H ₂ of the elevation angle, the elevation angle is set to H ₂
Restrict to

As a result, when the calculated elevation angle is out of the limit range, it is possible to limit it so that it falls within the limit range and prevent the operator from being confused. Particularly, in the virtual three-dimensional space display device according to the present embodiment, the higher the viewpoint position, the lower the upper limit value of the range of elevation angle change in the viewpoint direction to eliminate the state in which only the view of the sky can be seen. The lower the position, the higher the lower limit value of the range of elevation angle change in the line-of-sight direction can be eliminated to eliminate the situation where only the scenery of the ground can be seen.

Moreover, even when the viewpoint position is close to the ground surface, when the user is approaching a projecting object such as a building, the upper limit of the elevation angle in the line-of-sight direction is set to a value such that the upper layer of the projecting object can be seen. By setting, it is possible to look up to the upper layer of the protruding object.

Next, the processing when the elevation angle is allowed to be out of the range of change will be described with reference to FIG.
First, it is determined whether or not there is an operator's operation shown in step S301. Here, if there is no operation by the operator, the determination is No and the process proceeds to step S302, and if there is an operation, the determination is Yes and the process proceeds to step S304.

If there is no operation by the operator,
Since the elevation angle is calculated in the elevation angle limitation calculation process (S104) shown in FIG. 1, it is determined whether or not this elevation angle is within the limitation range by the determination in step S302. If it is within the range, the elevation angle is changed as it is, and if it is out of the range, the elevation angle returning process shown in the next step S303 is performed. The elevation angle returning process in step S303 is the same as the elevation angle returning process S107 shown in FIG.

In the elevation angle returning process, the elevation angle is changed by a fixed angle so that the elevation angle approaches the limit range. For example, when the altitude and the elevation angle of the viewpoint position are at the position of H ₃ shown in FIG. 4 by the operation of the operator, the elevation angle is changed to the upper limit value H ₁ when the operator does not operate. As a result, even when the elevation angle is out of the limit range due to the operator's operation, the elevation angle is automatically corrected to fall within the limit range when the operation is finished. In other words, even if the operator finds it difficult to grasp the space spatially while performing the desired operation, if the operation is stopped, the elevation angle gradually returns to within the limit range, and the operator can see the virtual three-dimensional space. You will be able to recover your sense of position.

If there is an operation by the operator in the determination of step S301 shown in FIG.
In step 304, the elevation angle is calculated similarly to step S201 shown in FIG. Next, in the determination shown in step S305, it is determined whether the calculated elevation angle is within the limit range. If the elevation angle is within the limited range, the answer is Yes and the change is made using the elevation angle as it is.

On the other hand, if the elevation angle is out of the restricted range, the determination is No and the elevation angle operation feeling process shown in the next step S306 is performed. The elevation angle operation feeling process of step S306 is the same as the elevation angle operation feeling process (S108) shown in FIG. In the elevation angle operation feeling process, a process of causing the operation means to issue a warning such as force feedback proportional to the degree to which the elevation angle deviates from the limit range.

Specifically, when the joystick 4 having a force feedback function (see FIG. 2) is used as the operating means, the operator further operates the stick portion when the elevation angle is larger than the upper limit value. If you try to increase the elevation angle by (pulling the stick part toward you), a torque proportional to the difference between the elevation angle and the upper limit will be applied in the direction opposite to this direction (the direction that pushes the stick part forward). generate.

Similarly, if the operator tries to reduce the elevation angle by further operating the stick portion (operation of pushing the stick portion forward) when the elevation angle is smaller than the lower limit value, this operation direction is opposite. A torque proportional to the difference between the elevation angle and the lower limit is generated in the direction of (the direction in which the stick portion is pulled toward you).

When the three-dimensional mouse 5 having a vibration function (see FIG. 2) is used, a predetermined vibration is applied instead of the torque described above. That is, vibration is generated at intervals proportional to the difference between the elevation angle and the upper limit value or the lower limit value (when the difference is large, the interval is short, and when the difference is small, the interval is large).

Further, a predetermined sound may be output instead of or in addition to torque or vibration. That is, the sound output device (see FIG. 1) generates a sound having a frequency proportional to the difference between the elevation angle and the upper limit value or the lower limit value (a large difference indicates a high frequency and a small difference indicates a low frequency), and the speaker 7
(See FIG. 2).

By such a warning, even if the operator exceeds the predetermined limit range while changing the elevation angle by his / her own operation, if the operator exceeds the predetermined limit range with the judgment of whether or not the range is exceeded. Will be able to intuitively grasp the degree.

Next, in the drawing process (S106) shown in FIG. 1, the new viewpoint position and line-of-sight direction obtained by the viewpoint line-of-sight changing process (S105) are used to form a triangle polygon group forming a terrain and a triangle polygon group forming a building. And are subjected to general hidden surface processing, shading processing, etc., and displayed on the CRT 8 shown in FIG.

By sequentially executing the processes of S101 to S106, the viewpoint position and the line-of-sight direction in the virtual three-dimensional space are changed based on the operation of the operator, and the scenery seen by the viewpoint position and the line-of-sight direction is a three-dimensional image. Is visually presented as. By repeating this series of processing, altitude (viewpoint ground altitude) and distance (protruding object distance)
The elevation angle limit range is set according to the size of the, and it becomes possible to comfortably fly around in the virtual three-dimensional space and observe the desired scenery without falling into a confusion state where the spatial grasp is lost. .

[0062]

As described above, the virtual three-dimensional space display device of the present invention has the following effects. That is, according to the present invention, it is possible to set the range of change in the line-of-sight direction according to the positional relationship between the reference position and the viewpoint position such as the ground surface or an object protruding from the ground surface, so that the display means displays only the image of the ground only or the sky. The image is not displayed, and the operator can always grasp the spatial position.

Further, even if the change range of the line-of-sight direction is exceeded, the line-of-sight direction is automatically corrected, so that even if the spatial grasp is lost, it can be immediately recovered. Become. Further, when the change range of the line-of-sight direction is exceeded, it is possible to sensuously grasp the fact by a predetermined warning.

[Brief description of drawings]

FIG. 1 is a diagram illustrating an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a hardware configuration.

FIG. 3 is a diagram illustrating an elevation angle when there is a building.

FIG. 4 is a diagram for explaining elevation angle limitation according to altitude.

FIG. 5 is a flowchart illustrating an elevation angle limiting process.

FIG. 6 is a flowchart illustrating processing when an elevation angle is out of range.

FIG. 7 is a diagram for explaining how to look at an elevation angle in (a) and (b).

[Explanation of symbols]

 1 CPU 2 Memory 3 Mouse 4 Joystick 5 3D Mouse 6 Keyboard 7 Speaker 8 CPU 9 External Storage Device 10 Computer Main Body P Position Calculating Means Q Sight Range Setting Means R Sight Direction Return Means T Operation Feeling Means

Claims (4)

[Claims] 1. A virtual three-dimensional space display device for changing a viewpoint position and a line-of-sight direction with respect to an image in a virtual three-dimensional space displayed on a display means by operating a predetermined operation means, wherein the virtual three-dimensional space Position calculating means for calculating the positional relationship between the predetermined reference position and the viewpoint position in the virtual three-dimensional space, and based on the distance calculated by the position calculating means, A virtual three-dimensional space display device, comprising: a line-of-sight range setting means for setting a change range. 2. When the line-of-sight direction is changed by operating the operation unit, the line-of-sight direction is outside the set range of change of the line-of-sight direction, and after the operation of the operation unit is stopped, the line-of-sight direction is changed. The line-of-sight direction returning means for performing a process of returning to the inside of the change range is provided.
The virtual three-dimensional space display device described. 3. When changing the line-of-sight direction by operating the operation unit, a process of changing the operation load of the operation unit while the line-of-sight direction is outside the set range of change of the line-of-sight direction. The virtual 3 according to claim 1 or 2, further comprising an operation feeling generating means for performing the operation.
Dimensional space display device. 4. When the visual line direction is changed by operating the operating means, an operational feeling of performing a process of outputting a predetermined sound while the visual line direction is outside the set change range of the visual line direction. The virtual three-dimensional space display device according to claim 1 or 2, further comprising a generation unit.